Radiantz LED Retroz Turn Signal Inserts 9520-17 A pair of 48 LED turn signal retros for the stock Harley bullet style housing With the base on the wires the install is as easy as removing your existing bulb and plugging in the new LED light Choose a 1157 (dual function) or 1156 (single function) Since LEDs do not take as much power to run as a regular bulb a load equalizer may be required when using LEDs